Semiconductor integrated circuit having wirings for power supply suited for computer-aided-design

Abstract

A semiconductor integrated circuit of standard-cell type or gate-array type includes a plurality of first cells arranged in a plurality of parallel lines, the first cells having first wirings for supplying power, the first wirings being extended over a plurality of the first cells arranged in the same line in a direction of the same line of the first cells, a second cell disposed in the neighbourhood of some of the first cells and having a dimension larger than the first cells, said second cell having second wirings on a periphery thereof to surround circuit portion of the second cell and means for connecting the second wirings with the first wirings in the first cells in the neighbourhood of the second cell.

What is claimed is: 
     
       1. A semiconductor integrated circuit comprising: a semiconductor chip;   a plurality of first groups of circuit elements formed on said semiconductor chip, said first groups of circuit elements being arranged in a plurality of lines, each circuit element in said first groups having first and second power supply wirings formed thereon in parallel with said lines for supplying a power voltage to said circuit elements in the same first group via circuit wirings, said first power supply wirings of said first groups on the same line being connected to each other to form a straight line, and said second power supply wirings of said first groups in the same line being connected to each other to form another straight line;   a second group of circuit elments formed at a predetermined area of said semiconductor chip; said area being surrounded by said first groups, one side of said area facing a plurality of said lines of said first groups, said second group having third and fourth power supply wirings formed on a peripheral portion of said area to surround said circuit elements of said second group, said third and fourth power supply wirings supplying said power voltage to said circuit elements of said second group via other circuit wirings; and   means formed on said semiconductor chip for extending said straight lines of said first and second power supply wirings beyond said first groups facing said side of said area to said third and fourth power supply wirings, respectively.   
     
     
       2. A semiconductor integrated circuit as claimed in claim 1, wherein said first groups of circuit elements are formed on areas of substantially the same width relative to a direction which is perpendicular to said lines, said first and second power supply wirings for supplying said first groups extending respectively through the same positions relative to said width and in parallel with said lines. 
     
     
       3. A semiconductor integrated circuit comprising: a semiconductor chip;   a plurality of first groups of circuit elements formed on said semiconductor chip, said first groups of circuit elments being arranged in a plurality of lines, each circuit element in said first groups having first and second power supply wirings formed thereon in parallel with said lines for supplying a power voltage to said circuit elements in the same first group, said first power supply wirings of said first groups on the same line being connected to each other to form a straight line, and said second power supply wirings of said first groups in the same line being connected to each other to form another straight line;   a second group of circuit elements formed at a predetermined area of said semiconductor chip, one side of said area facing a plurality of said lines of said first groups, said second group having third and fourth power supply wirings formed on a peripheral portion of said area to surround said circuit elements of said second group, said third and fourth power supply wirings supplying said power voltage to said circuit elements of said second group;   means formed on said semiconductor chip for extending said straight lines of said first and second power supply wirings beyond said first groups facing said side of said area to said third and fourth power supply wirings, respectively;   a plurality of first internal power supply wirings formed in parallel with on another on an internal region of said second group of circuit elements which are surrounded by said peripheral portion with a connection to said third power supply wiring; and   a plurality of second internal power supply wiring; and in parallel with one another on said internal region of said second group with a connection to said fourth power supply wiring.   
     
     
       4. A semiconductor integrated circuit as claimed in claim 3, wherein said first internal power supply wiring are disposed orthogonally to said second internal power supply wirings. 
     
     
       5. A semiconductor integrated circuit as claimed in claim 1, further comprising a fifth power supply wiring formed on said semiconductor chip in said peripheral portion on said side of said area of said second group in parallel with said third and fourth power supply wirings, said fifth power supply wiring being connected with one of said third and fourth power supply wirings, a first internal power supply wiring formed on an internal region of said second group surrounded by said peripheral portion with a connection to said third power supply wiring, and a second internal power supply wiring formed on said internal region of said second group with a connection to said fourth power supply wiring, said straight line of said first power supply wirings being extended for connection with said fifth power supply wiring, and said other straight line of said second power supply wirings being extended for connection with said third power supply wiring. 
     
     
       6. A semiconductor integrated circuit as claimed in claim 5, wherein said first group has substantially a same width in a direction which is perpendicular to said lines, said first and second power supply wirings running on said first groups respectively through the same positions of said width in parallel with said lines.